<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>12_指令_自定义指令</title>
</head>
<body>

<!--
1. 注册全局指令
  Vue.directive('my-directive', function(el, binding){
    el.innerHTML = binding.value.toupperCase()
  })
2. 注册局部指令
  directives : {
    'my-directive' : {
        bind (el, binding) {
          el.innerHTML = binding.value.toupperCase()
        }
    }
  }
3. 使用指令
  v-my-directive='xxx'
-->
<!--
需求: 自定义2个指令
  1. 功能类型于v-text, 但转换为全大写
  2. 功能类型于v-text, 但转换为全小写
-->

<div id="test">
  <p v-upper-text="msg"></p>
  <p v-lower-text="msg"></p>
</div>

<div id="test2">
  <p v-upper-text="msg"></p>
  <p v-lower-text="msg"></p>
</div>

<script type="text/javascript" src="../js/vue.js"></script>
<script type="text/javascript">
  // 注册一个全局指令
  // el: 指令所在的标签对象
  // binding: 包含指令相关数据的容器对象
  Vue.directive('upper-text', function (el, binding) {
    console.log(el, binding)
    el.textContent = binding.value.toUpperCase()
  })
  new Vue({
    el: '#test',
    data: {
      msg: "I Like You"
    },
    // 注册局部指令
    directives: {
      'lower-text'(el, binding) {
        console.log(el, binding)
        el.textContent = binding.value.toLowerCase()
      }
    }

  })

  new Vue({
    el: '#test2',
    data: {
      msg: "I Like You Too"
    }
  })
</script>
</body>
</html>